# Facts402, pay as you go: Phone validation API

> Use when an agent needs phone number validation for CRM, KYC or calling: valid/possible, E.164 and national formats, country, type (mobile, fixed line, toll-free, VoIP...), original carrier, location and time zones, for any number worldwide. Offline, instant.

Facts402's x402 pay per call plan for the phone validation API costs $10.00 per 1,000 phones. We check each provider's docs for 9 fields. Facts402's docs list 6: Number, Formats, Validity, Type, Carrier, Place.
We haven't run Facts402 through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
We rank 1,283 plans for phone validation APIs by price. Half the plans cost $3.60 or less per 1,000 phones. This plan costs less per 1,000 phones than 24% of the 1,283 plans.
[GuGuData's CNY 124 (about $19) monthly plan](https://datacircle.dev/validate-phone-apis/gugudata/cny-124-monthly/llms.txt) is the cheapest paid plan per 1,000 phones. GuGuData's CNY 124 (about $19) monthly plan charges nothing per call. You get as many phones as GuGuData's rate limit allows. [Neutrino API's On-Demand plan](https://datacircle.dev/validate-phone-apis/neutrino-api/pay-as-you-go-on-demand/llms.txt) costs the least for 10,000 phones a month: $0.80.
[Trestle](https://datacircle.dev/validate-phone-apis/trestle/top-up-from-10-self-serve-pay-as-you-go-get-3-0-phone-intel-phone-validation-api/llms.txt), [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) and [Abstract API](https://datacircle.dev/validate-phone-apis/abstract-api/19-monthly-starter-5000-requests-month/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/facts402/pay-as-you-go
- [Phone validation API: the best of 50+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://api.facts402.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://api.facts402.com/phone`
- API key: not needed
- Its API docs: https://api.facts402.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#/paths/~1phone
- Sold by: Facts402 (https://api.facts402.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 67%
- Number: ✓
- Formats: ✓
- Validity: ✓
- Type: ✓
- Carrier: ✓
- Place: ✓

## Price

- $ per 1,000 phones: $10.00
- Per: call
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Use when an agent needs phone number validation for CRM, KYC or calling: valid/possible, E.164 and national formats, country, type (mobile, fixed line, toll-free, VoIP...), original carrier, location and time zones, for any number worldwide. Offline, instant.

## Data

- Freshness: stored
- Countries: Worldwide
- What it checks: numbering plan
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: number. Optional: default_region
- Method: POST
- Path: /phone

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone with a wallet paying USDC on Base (x402 v2), with no account or API key

## The 13 fields the plan's answer can hold

phone number, valid, possible number, E.164 format, international format, national format, country calling code, country code, location, carrier, line type, time zone, disclaimer

## Facts402's plans (1)

- [Facts402, pay as you go](https://datacircle.dev/validate-phone-apis/facts402/pay-as-you-go/llms.txt): $10.00 per 1,000, 67% complete, stored

## Facts402's calls for this API (1)

- `POST /phone`: [Facts402, pay as you go](https://datacircle.dev/validate-phone-apis/facts402/pay-as-you-go/llms.txt)

## Facts402's APIs (4)

- [Facts402: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/facts402/pay-as-you-go/llms.txt)
- [Facts402: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/facts402/pay-as-you-go/llms.txt)
- [Facts402: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/facts402/pay-as-you-go/llms.txt)
- [Facts402: company enrichment API pricing, 1 plan, POST /vat](https://datacircle.dev/company-enrichment-apis/facts402/pay-as-you-go-x402-pay-per-call-post-vat/llms.txt)
- [Facts402: company enrichment API pricing, 1 plan, POST /lei](https://datacircle.dev/company-enrichment-apis/facts402/pay-as-you-go-x402-pay-per-call-post-lei/llms.txt)

## Facts402: phone validation API alternatives

- [ProWebLook, $4.99 pack](https://datacircle.dev/validate-phone-apis/proweblook/4-99-pack/llms.txt): $9.98 per 1,000, 67% complete, stored
- [Xverify, $5 pack](https://datacircle.dev/validate-phone-apis/xverify/5-pack/llms.txt): $10.00 per 1,000, 44% complete, stored
- [YepAPI, top-up](https://datacircle.dev/validate-phone-apis/yepapi/top-up/llms.txt): $10.00 per 1,000, 44% complete, stored
- [Ringer (Telique), top-up from $10, Paid, GET /v1/telique/lrn/{phone_number}](https://datacircle.dev/validate-phone-apis/ringer-telique/top-up-from-10-paid-get-v1-telique-lrn-phone-number/llms.txt): $10.00 per 1,000, 33% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-09.

- https://api.facts402.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://api.facts402.com/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://api.facts402.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://api.facts402.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing